BE33 PLT ENTERED ONT CLASS C BEFORE ESTABLISHING COM WITH SCT CTLR.

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PLANNED TO FLY GPS DIRECT FROM FLABOB ARPT TO SACRAMENTO EXECUTIVE ARPT. PROGRAMMED GPS AND DEPARTED TO THE W (RWY 24 AS I RECALL); STRAIGHT OUT INITIALLY. WAS AWARE THAT ONT ARPT WAS NW OF MY DEP LOCATION (FLABOB ARPT). DID NOT RECEIVE/NOTICE A GPS MESSAGE THAT I WAS APCHING WITHIN CLASS C AIRSPACE. FIRST TIME VISIT TO THIS ARPT; NOT FAMILIAR WITH AIRSPACE IN VICINITY OF DEP ARPT. DID NOT ADEQUATELY REVIEW LA TERMINAL CHART DURING PREFLT. SOME DISTR BY PAX DURING CLBOUT. UNABLE TO ESTABLISH IMMEDIATE CONTACT WITH ATC TO REQUEST FLT FOLLOWING (ENTRY INTO CLASS C). RELIED ON GPS TO WARN ME OF APCH TO RESTR AND SPECIAL USE AIRSPACE. WHEN CONTACT WITH ATC WAS ESTABLISHED; I WAS INFORMED THAT I WAS ALREADY WITHIN CLASS C. GPS SCALE WAS AT 10 NM AND DID NOT SHOW LIMITS OF CLASS C OR PROVIDE WARNING MESSAGE. REF TO LA TERMINAL CHART INDICATES THAT OUTER LIMIT OF CLASS C IS ENTERED IMMEDIATE ON 'WB' TKOF FROM FLABOB ARPT. NOTE -- INITIAL ATTEMPT TO CONTACT ATC FAILED (WRONG FREQ). ASSUME GPS WARNING NOT RECEIVED/NOTICED DUE TO: MAP SCALE FACTOR (10 NM) AND LOCATION OF CLASS C TO FLABOB ARPT. THOROUGHLY REVIEW ALL ASPECTS OF SECTIONAL/TERMINAL CHARTS PRIOR TO EACH DEP. SELECT APPROPRIATE MAP SCALE WHEN USING GPS IN TERMINAL ENVIRONMENT. ENSURE APPROPRIATE FREQ TO CONTACT ATC TO ESTABLISH RADIO CONTACT IS KNOWN. INFORM PAX TO MINIMIZE CONVERSATION DURING TKOF/CLBOUT PHASE OF FLT. DO NOT RELY ON GPS (EXCLUSIVELY) FOR SITUATIONAL AWARENESS; NEVER 'ASSUME' ANYTHING; GET PLENTY OF SLEEP!